11 results about "Slump flow" patented technology

Provided is an apparatus and method for measuring slump and slump flow of concrete, including introducing concrete into a feed tank, opening a feed valve to allow the concrete to fall into a slump cone, and controlling, by a slump plate operation mechanism, the slump cone carried by the slump plate to move away from the feed valve. A slump cone operation mechanism controls the slump cone to move away from the slump plate along a direction perpendicular to the slump plate, leaving the concrete on the slump plate. A slump and slump flow measurement mechanism projects a slump / slump flow marker onto the concrete left on the slump plate to capture an image of the concrete and the slump / slump flow markers. The captured image is output to a processor to calculate the slump / slump flow of the concrete.

The utility model discloses a high-precision concrete self-compacting J-shaped ring, and relates to the technical field of concrete testing, a J-shaped ring body is slidably connected with a sliding part, the sliding part is horizontally provided with a first fixing rod, the first fixing rod is slidably connected with a laser module, and a fixing clamp is clamped and fixed on the J-shaped ring body. A second fixing rod is horizontally arranged on the fixing clamp, a diffuse reflection type photoelectric sensor is vertically arranged at one end of the second fixing rod, a timing module and a mirror reflection type photoelectric sensor which is horizontally arranged are arranged at the other end of the second fixing rod, and the diffuse reflection type photoelectric sensor and the mirror reflection type photoelectric sensor are both electrically connected with the timing module; and the J-shaped ring body is also provided with a light reflecting plate. The device does not depend on a concrete expansion flow meter for measurement, so that measurement can be carried out on any conditional construction site, a measurement result can be quickly obtained to help timely adjustment of site construction, and meanwhile, each structure can be detached, so that transportation and flexible use are facilitated.

The utility model discloses a portable concrete slump expansion degree instrument, which comprises four splice plates, a measuring device and a controller, the four splice plates are mutually spliced to form a plate body with a rectangular structure; the connecting assemblies are arranged on the two adjacent sides of each splicing plate, and the four splicing plates are fixedly connected through the connecting assemblies; the connecting assembly comprises alignment pieces and fastening pieces, the alignment pieces are integrally arranged on the two adjacent sides of the splice plates, the fastening pieces penetrate through the two adjacent splice plates, it is guaranteed that the four splice plates are firmly installed, overall splicing is achieved, and the complete expansion degree instrument is formed; the handle is mounted on any side, without the connecting component, of the splice plate; by means of the design, an existing integrated concrete slump expansion instrument is changed into a detachable module, in practical application, the concrete slump expansion instrument can be assembled on site, the purpose of saving the vehicle loading space is achieved, in the idle state, the storage space in a test room can be reduced, and collection and detection are convenient.

This invention discloses a computer vision-based method and system for detecting the workability of concrete. It employs a non-contact visual sensing approach to simultaneously acquire video sequences of freshly mixed concrete in a free-flowing state at both the macroscopic slump flow scale and the microscopic particle migration scale. An improved spatiotemporal feature pyramid network is used to extract multi-scale morphological features from the video sequences, obtaining a multi-scale visual feature set including the flow profile evolution rate, surface ripple spectrum, aggregate suspension trajectory, and paste coating state. A graph neural network model integrating prior knowledge of fluid mechanics is constructed to map discrete visual features to continuous rheological parameters, outputting workability indicators such as slump, spread, yield stress, and plastic viscosity in real time. This invention significantly improves the level of intelligent quality control in concrete production.

The invention relates to self-compacting concrete, and discloses a design method of a self-compacting concrete mix proportion based on coarse aggregate close packing, which simulates a coarse aggregate single-layer close packing phenomenon in a self-leveling state of the self-compacting concrete according to a spherical particle plane triangular packing mode. A prediction model of the volume fraction of the coarse aggregate about the average particle size and the slump expansion degree of the coarse aggregate is established, the volume fraction of the coarse aggregate is predicted according to the prediction model, and then the mix proportion design of the self-compacting concrete is guided. Compared with the prior art, the coarse aggregate volume fraction prediction model and the mix proportion design method are provided on the basis of coarse aggregate close packing, the mixing amount of the coarse aggregate is increased, the performance of the self-compacting concrete is good, the use amount of each component can be given more accurately and scientifically, the economical efficiency is improved, and the method has engineering application value.

The utility model relates to the technical field of noise reduction equipment, and provides a recycled aggregate porous concrete acoustic board which comprises a first concrete layer and a second concrete layer, and the first concrete layer and the second concrete layer are stacked to form an acoustic board block. The void ratio of bone grains in the first concrete layer is 10%-30%, the slump of concrete in the second concrete layer is larger than 200 mm, and the slump expansion degree ranges from 450 mm to 550 mm. According to the recycled aggregate porous concrete acoustic board, the first concrete layer and the second concrete layer are arranged, the first concrete layer is the porous concrete layer, and concrete in the second concrete layer is concrete with high fluidity, so that the acoustic board has a good sound absorption effect, and meanwhile, the dead weight of the acoustic board is reduced; the recycled aggregate porous concrete acoustic board can be suitable for various application scenes, and the applicability of the recycled aggregate porous concrete acoustic board is improved.

The application discloses a normal-temperature-synthesized concrete viscosity reducer and a preparation method thereof, and belongs to the technical field of building materials. The concrete viscosity reducer comprises the following components: liquid polyether 60-75% by mass, unsaturated carboxylic acid monomer 3-6%, unsaturated functional monomer 0.05-0.5%, oxidizing agent 0.1-0.5%, reducing agent 0.03-0.2%, chain transfer agent 0.05-0.3%, alkali solution 1-3%, and the rest is deionized water. The viscosity reducer prepared by the application can obviously reduce the viscosity of concrete mixture, can be synthesized at normal temperature, has low production energy consumption and cost, can increase economic benefits, has the characteristics of low mixing amount, and can obviously reduce the inversion slump flow cylinder emptying time of high-strength concrete.

The invention relates to a low-temperature retarding material additive and a preparation method thereof, and belongs to the technical field of retarding material additives. The low-temperature retarding material additive is mainly prepared from the following components in parts by weight: 3 to 5 parts of gamma-polyglutamic acid, 4 to 6 parts of sodium monofluorophosphate, 8 to 12 parts of trimethylolethane, 2 to 4 parts of Na3PO4, 12 to 15 parts of sodium carboxymethyl cellulose, 8 to 10 parts of silica sol, 5 to 7 parts of modified polysaccharide, 3 to 4 parts of polyvinylpyrrolidone and a water reducing agent. By adding the retarder, the slump and expansion loss of a concrete mixture can be reduced, the initial setting time is relatively prolonged, and the compressive strength of concrete can be basically unchanged.

To provide a flowable backfilling material that is easy to control in quality and has high manufacturing efficiency and environmental friendliness, and a manufacturing method of the flowable backfilling material.SOLUTION: A flowable backfilling material 1 of the present invention is made by kneading a binder 10, aggregate 20, and water 30. The binder 10 contains an active filler 11. The aggregate 20 is made of granulated fine aggregate 21 or sludge powder 22 derived from the granulated fine aggregate 21 and sludge cake A, and has a slump flow value of 200 mm or more and an uniaxial compressive strength (28 days) of 0.3 N / mm2 or more. In a manufacturing method of the flowable backfilling material of the present invention, the binder 10, aggregate 20, and water 30 are kneaded to manufacture the flowable backfilling material 1. The binder 10 contains the active filler 11. The aggregate 20 is made of the granulated fine aggregate 21 or the sludge powder 22 derived from the granulated fine aggregate 21 and the sludge cake A. The materials are mixed so that the slump flow value is 200 mm or more and the uniaxial compressive strength (28 days) is 0.3 N / mm2 or more.SELECTED DRAWING: Figure 1

The invention relates to self-compacting concrete and a preparation method thereof, and belongs to the technical field of concrete materials. Raw materials of the self-compacting concrete comprise carbonized steel slag aggregate, a solid waste-based cementing material and an auxiliary agent, the carbonized steel slag aggregate is approximately spherical and has multi-stage grain size distribution, and the carbonized steel slag aggregate comprises steel slag fine aggregate and steel slag coarse aggregate; wherein the self-compacting concrete comprises the following raw materials in parts by weight: 10-30 parts of the solid waste-based cementing material, 0-50 parts and more than 0 of the steel slag fine aggregate, and 0-50 parts and more than 0 of the steel slag coarse aggregate. The self-compacting concrete prepared by the invention meets at least one of the following indexes: the slump expansion degree is 550-700mm, and the expansion time is T500lt; the separation rate SR2 is smaller than or equal to 15% in 2s, the porosity is 1%-3%, the water permeability coefficient is lower than 1 * 10 <-12 > m / s, and the 28d compressive strength meets the strength grade of C30-C50.

The utility model relates to the technical field of self-compacting concrete, in particular to a self-compacting concrete slump expansion degree automatic testing device which comprises a base, a measuring mechanism for measuring concrete slump expansion degree is arranged on the upper surface of the base, and a limiting mechanism is arranged in the base. A third motor and a plurality of supporting rods are fixed to the upper surface of the base, and a top plate is fixed to the upper surfaces of the multiple supporting rods. According to the automatic testing device for the slump expansion degree of the self-compacting concrete, an electric push rod drives a measuring rod to move together with a height measuring instrument, a first motor drives a rotating rod and two first bevel gears to rotate together, and the first bevel gears drive a second bevel gear and a first threaded rod to rotate together; the two first threaded rods drive the moving block, the measuring rod and the height measuring instrument to move together, and after the measuring rod is attached to the top of concrete, the slump expansion degree is obtained through the numerical value measured by the height measuring instrument and the height of the slump cylinder.